package org.example.java.jvm.error;

import sun.misc.Unsafe;

import java.lang.reflect.Field;

/**
 * VM Args：-Xmx20M -XX:MaxDirectMemorySize=10M
 */
public class DirectMemoryOOM {
  private static final int _1MB = 1024 * 1024;


  public static void main(String[] args) throws Exception {
    Field unsafeField = Unsafe.class.getDeclaredFields()[0];
    unsafeField.setAccessible(true);
    Unsafe unsafe = (Unsafe) unsafeField.get(null);
    while (true) {
      unsafe.allocateMemory(_1MB);
    }
  }
}
